Service manual boiler protherm gepard 23 mov. Double-circuit gas boiler proterm cheetah. The principle of operation and technical features of the equipment
With the onset of winter, you want more comfort and warmth in your home. But property owners are also pleased with a modest electricity bill. If you install a gas boiler in your home, you can enjoy its power and energy efficiency. However, the store today presents a huge variety of such devices, and making the right choice can sometimes be quite difficult. Among others, you will find Gepard gas boilers, which have been known to the Russian consumer for more than a year. This equipment is inexpensive, solid, and also belongs to the middle class and has European quality. It is possible to verify this by reviewing the characteristics presented below.
Characteristics
Gas boilers "Gepard" double-circuit type are used for heating and providing housing with hot water. The liquid is heated separately, sanitary water enters the radiators and the bathroom, while drinking water goes to the kitchen. The system has a built-in water heater, the volume of which can be from 30 to 60 liters. If there are several points of water intake in the house, then a larger volume of liquid is consumed, in this case it is best to install the second option.
Single-circuit gas boilers "Gepard" have At the same time, the maximum consumption of heated water is possible without unnecessary load. The designs use room temperature controllers, and the liquid for heating and water supply systems is heated separately. Among the popular models of the manufacturer, Protherm "Panther 25 KTV" can be distinguished. This is wall-mounted equipment with a maximum power of 24.6 kW. The device has a closed combustion chamber and costs 33,600 rubles. If we are talking about the Protherm "Gepard 23 MTV" model, then its maximum power is 23.3 kW, and the cost is 27,600 rubles. The Gepard series is represented by both closed and open combustion chambers. The first version of the boilers can be installed in a room where there is no chimney. This is ensured by a coaxial system, due to which gases are removed.
Reviews about the boiler "Proterm Gepard 23 MTV"
If you are interested in Gepard gas boilers, then you can pay attention to the characteristics of the model mentioned in the subtitle. Installation in the apartment will take a minimum amount of time and money, the equipment will be able to maintain a comfortable temperature. Heating is carried out in the range from 38 to 60 ° C, with regard to hot water supply, and from 38 to 80 ° C - for the heating system. According to buyers, the design is quite sensitive to hard water, so it's best to take care of the cleanliness of the liquid. For this, a filter is installed. Buyers also like the fact that this equipment goes on sale without extra charges, so you can purchase devices at a minimal cost.
Boiler installation
Gepard gas boilers, the reviews of which you could read above, must be installed taking into account the requirements, they provide for the need for an area that must be equal to 4 m 2 or more. The ceiling height must be 2.5 m. The width of the door must be equivalent to 80 cm, the unit must be illuminated through the openings. The presence of window openings is also stipulated by the rules. For every 10 m 2 of the room there should be at least 0.3 m 2 of windows. When the Proterm Gepard gas boiler is installed, it is important to ensure good ventilation in the room, because gas combustion is provided by fresh air. The area of the oxygen entry hole should be equivalent to 8 cm2 per kilowatt of power. Pipes through which gas will be transported must be made of metal. Flexible hoses are only used to connect consumers.
The power supply system of the equipment must have a circuit breaker with thermal protection. Gas equipment must be located in the basement of a private residential building. If we are talking about a multi-storey apartment building, then a gas boiler in the basement cannot be placed. The gas boiler "Proterm Gepard" must be equipped with a meter. From it should be removed at least 20 cm, this also applies to flammable materials. Depending on the power of the equipment, the distance between the wall and the boiler can be from 30 to 50 cm.
Boiler device
The gas boiler "Gepard 23" consists of a body, inside of which a combustion chamber is located. Outside, its walls are covered with insulating material. Below is a gas burner and an igniter. Above is the main heat exchanger made of heat-resistant steel or cast iron, the coolant passes through it. The secondary heat exchanger is located outside the combustion chambers. An automatic element is installed in front of the burner, which provides for the presence of a gas valve and a thermostatic regulator. For mixing and distributing water flows, in addition to the main equipment, the device is equipped with a circulation pump, an expansion tank and a fan for forced supply of fresh air.
The main malfunctions of the boiler
The Gepard gas boiler, the price of which was mentioned above, may encounter some malfunctions during operation. For example, error f28 on the display indicates that the ignition attempt was unsuccessful. You should blow out the nozzles, and also check the flow of gas. After that, you need to try to ignite again. But if you saw error f75 on the display, then this indicates a repetition of the error in checking the pressure level. In this case, you should call a specialist to inspect the condition of the heating system.
Conclusion
After installing the Gepard gas equipment, the first settings must be performed by a company specialist. This is required in order to select the most suitable pressure level for the heating system and set the temperature indicators at the desired level. Otherwise, the equipment may not be covered by the warranty.
The Protherm Cheetah 23 MTV boiler is designed for heating individual houses, cottages, country houses, summer cottages up to 200-230 sq.m. + for the organization of hot water supply. This boiler has separate heat exchangers, which is a great advantage where the water is hard. By default, the boiler runs on natural main gas, but if necessary, the boiler can be converted to work on liquefied gas, for this you need to purchase a set of jets.
A closed combustion chamber (in other words, such boilers are called turbocharged) implies the presence of a fan in this boiler, which forcibly takes in air and removes combustion products to the street. For such boilers, coaxial chimneys are usually used - "pipe in pipe".
The wall-mounted gas boiler Protherm Cheetah 23 MTV is made on the basis of improved and therefore more durable components. The manufacturer improved the hydraulic group and installed an Italian-made SIT gas valve. The boiler turned out to be reliable, economical and inexpensive - the perfect balance of advantages for home heating. Key features of this model:
- Separate heat exchangers;
- High performance hot water supply;
- Closed combustion chamber;
- Hydroblock made of composite materials;
- Electronic flame modulation.
The boiler will be an ideal choice for heating small country houses, private houses and apartments with individual heating.
The wall-mounted gas boiler Protherm Cheetah 23 MTV is made according to a double-circuit scheme with separate heat exchangers. The primary heat exchanger is made of copper - it is responsible for heating the coolant in the heating circuit. The plate secondary heat exchanger is made of stainless steel - it is responsible for the preparation of hot water in the DHW circuit. Its productivity is up to 11.4 l / min. Thermal power is 24 kW, which corresponds to 240 square meters. m. heated rooms. The boiler was endowed with an electronic flame modulation system, thanks to which it can withstand the temperature in both circuits with an accuracy of up to a degree - consumers are waiting for the stable operation of the heating system and hot water in the taps at any flow rate.
The boiler is designed for wall mounting. Thanks to its shallow depth of 310 mm, it is able to fit into any interior without disturbing it. This is also facilitated by the elegant and strict design of the boiler. Combustion products are removed through a coaxial chimney right behind the wall - a classic chimney is not needed here, just as the costs of arranging it in private households are not needed. The maximum gas consumption is 2.9 cubic meters. m/hour. It is also possible to work on liquefied gas with a maximum flow rate of 2.1 kg/h. The noise level during operation is minimal. The presence of a built-in piping will be an undoubted advantage - an expansion tank, a silent circulation pump with blocking protection and a safety group are already present inside the boiler.
The gas boiler Protherm Cheetah 23 MTV is a model of reliability and safety. It is resistant to corrosion, starts easily at low air temperatures, is equipped with numerous security systems - they control the presence of a flame, monitor temperature and pressure, and protect the heating circuit from freezing. If necessary, the boiler can be used as an energy source for underfloor heating.
Protherm Cheetah 23 MTV is a time-tested and real experience gas boiler from a well-known brand. You can buy it in the Teplodvor online store at really competitive prices. Profitable promotions have been prepared for buyers, delivery in Moscow and Russia, pickup from the warehouse.
All are produced at the factory of the same name in Slovakia.
Options for organizing smoke removal:
- Horizontal coaxial chimney
- Separate smoke exhaust system
- Vertical coaxial chimney
Using the liquid crystal display, you can continuously receive information at any time during the operation of the boiler. The display allows you to constantly monitor the entire process.
Model 23 MTV is equipped with a coaxial flue gas system and does not require connection to a chimney, which allows them to be installed in rooms where there is no stationary chimney or its installation is very difficult or impossible due to various reasons.
Switching to DHW mode occurs automatically when the hot water tap is opened. The main feature of the boiler is the rapid heating of water, about 2 seconds.
The new boiler has a new display compared to the previous model. Bright backlight allows you to see the data on the screen now in a bright room during daylight hours.
The reliability and durability of the boiler is provided by a hydraulic block made of durable composite material, improved compared to the hydraulic block in the previous generation model. Copper heat exchanger and burner made of chromium-nickel steel, plate secondary heat exchanger made of stainless steel once again emphasize the quality of the boiler
The new SIT pneumatic gas valve is quieter than the previous generation gas valve.
- Description
- Characteristics
- Documentation
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Advantages:
burner auto-ignition system;
flame modulator;
room thermostat;
system self-diagnosis;
Equipment:
gas boiler PROTHERM GEPARD 23 MTV.
Description
Gas boiler PROTHERM 23 MOV CHEETAH
PROTHERM wall-mounted boiler CHEETAH MOV 23 uses natural or liquefied gas as fuel. This model is designed for heating (batteries and underfloor heating) and domestic hot water preparation. An open combustion chamber does not require the installation of a chimney, only forced ventilation, as it uses air directly from the room. The wall-mounted installation option and compact dimensions make it possible to choose the PROTHERM GEPARD 23 MOV boiler even for small spaces, for example, for a kitchen.
Advantages:
there is a start indicator of the device;
burner auto-ignition system;
flame modulator;
clear control panel with digital display;
built-in temperature sensor;
room thermostat;
system self-diagnosis;
anti-freeze system and overheating protection;
protection of the pump from blocking.
Equipment:
gas boiler PROTHERM GEPARD 23 MOV;
instruction manual and technical data sheet.
Did this model fit? We recommend paying attention to its analogue - gas boiler PROTHERM GEPARD 23 MTV.
Gas wall-mounted boiler PROTHERM GEPARD 23 MOV can be purchased at an affordable price in the Bigam online store. We have various payment methods: cash and bank transfer. Delivery is carried out by transport companies, courier or by the client, if there is our store in your city. A full range of service center services is also available: from warranty service to repair and sale of necessary spare parts.
Characteristics
For heating and hot water supply of apartments and small private houses with one bathroom, double-circuit gas boilers are usually used.
In large houses with several sanitary facilities for heating, single-circuit gas boilers with a storage boiler for preparing hot water are more often used. Such a system provides more comfortable use of hot water in the house.
In the apartment of a new building with apartment heating, a double-circuit gas boiler Protherm Gepard 23 MTV is installed. Next, consider setting the boiler power using the example of this apartment.
Gas boilers of the Protherm Gepard series (Cheetah) are almost a complete analogue (simpler version) of Protherm Panther boilers (Panther). This article describes in detail the adjustment, setting the power of gas boilers Protherm Gepard and Protherm Panther.
It should be noted that the company that produces Protherm series boilers at its other plant produces gas boilers of the well-known Vaillant brand. Vaillant gas boilers are in a higher price category due to the use of better materials for the manufacture of heat exchangers. But in terms of design, other parts used, and service menu settings, Vaillant brand gas boilers are very similar to Protherm boilers.
The principles of adjustment, power settings described in this article suitable for gas boilers of many other brands and manufacturers.
The internal arrangement of the double-circuit gas boiler Protherm Gepard 23 MTV and Panther 25.30 KTV (Panther)
Causes of clocking (pulse operation) of the boiler in heating mode
The instruction manual states that the useful heat output of the Protherm Gepard 23 MTV boiler is adjustable from a maximum of 23.3 kW. up to a minimum of 8.5 kW. The factory setting for heating power is set to 15 kW.
The total area of the apartment heated by the boiler is 60 m 2. To heat the apartment, heating devices (radiators) with a total maximum heat output of 4 kW.
How to determine the maximum thermal power of the heating circuit in a house or apartment
How to determine the maximum thermal output of the heating circuit? On the websites of manufacturers and sellers of radiators, we find the thermal power of each radiator installed in the house. In the catalogs of manufacturers, the heat transfer of radiators is presented in 2 modes: 1) 90/70/20 degrees and 2) 75/65/20, you need to look at the heat transfer by the parameter “75-65/20”. The sum of the capacities of all radiators connected to the boiler will be equal to the maximum heat output of the heating circuit. For the apartment from our example, this value turned out to be 4 kW.
The installers installed the boiler and put it into operation, "forgetting" to carry out commissioning work. The boiler was started to work with the factory setting of maximum power in heating mode 15 kW.
Obviously, a heating system with a maximum power of only 4 kW., will not be able to accept the thermal energy produced by the boiler with a capacity of 15 kW. The power of the boiler burner is automatically regulated within certain limits. But the huge difference in the power of the boiler and heating devices leads to the fact that the boiler automation is not able to bring the boiler power in line with the needs of the heating system without additional settings.
A large difference between the power of a gas boiler and the power of heating appliances, among other disadvantages, leads to the cyclical operation of the boiler.
By the way, about other disadvantages of a too powerful boiler. The service manual for the Protherm Gepard 23 MTV boiler indicates its efficiency in heating mode: 93.2% at maximum heat output (23.3 kW.) and 79.4% when operating at minimum power (8.5 kW.) Imagine how the efficiency will decrease even more if this boiler has to work with a heating system with a capacity of 4 kW. Please note that a double-circuit boiler during the year works most of the time in heating mode, with a minimum power. At least 1/4 of the gas used for heating will literally fly out uselessly into the pipe. This will be a retribution for installing overly powerful equipment for heating and hot water in the house.
Tips on the topic "How to increase the efficiency of a gas boiler" can be found if you read this article to the end.
Excessive cyclicity, impulsiveness of work or, as the people say, “boiler clocking” manifests itself in the fact that the burner of the boiler, after switching on, quickly turns off upon reaching the set temperature in the straight pipe at the outlet of the boiler. But at the same time, the radiators remain not warmed up to this set temperature - the water heated in the boiler simply does not have time to reach the heating devices. That is, the boiler produces more thermal energy per unit of time than a less powerful heating circuit can accept. Therefore, the water temperature at the outlet of the boiler rises rapidly and it turns off earlier, not having time to heat the radiators.
After a short time, the circulation pump supplies the heat exchanger with the remaining cool water from the return pipe of the heating system and the burner turns on again. Then everything repeats again.
A high-power heating system has an increased diameter of pipes and a volume of radiators, which means less hydraulic resistance. In large systems, water does not flow exactly the same, it flows faster, at a higher flow rate (liters per second). During the rapid passage through the boiler heat exchanger, each liter of water has time to heat up only 15-20 degrees about C. And in order to heat this liter to a given temperature, the water in the heating system must pass through the heat exchanger several times.
In low-power heating systems, the pipes are thinner, the radiators are smaller, the hydraulic resistance is higher and the water flows more slowly. If you heat slowly flowing water with the same power, then the water that enters the heat exchanger immediately, at a time, will heat up by 40-60 degrees about C, immediately to the maximum temperature, and the boiler will turn off. And the water remaining in the system, which has not reached the boiler, will remain cold until the next cycle of clocking. What happens in the boiler if its power is not adapted to the heating system.
The size of the flame (burner power) in the boiler is controlled by electronics according to a complex algorithm, which takes into account the time from the start of the burner, the temperature, the rate of temperature change in the heating circuit, and the temperature difference in the direct and return pipes. I do not know all the subtleties of the control algorithm, but automation, without additional service settings, does not ensure the normal operation of the boiler at a power below the minimum, which is indicated in the technical specification.
In a properly configured heating system, the temperature difference in the direct and return pipes should be no more than 20 about C.
Clocking reduces the life of the boiler and increases gas consumption
Any person, even not being a mechanic and electrician, knows that the most difficult operating mode for equipment is the moment of starting, turning on mechanical and electrical equipment. During the start-up period, the greatest wear is observed, most often failures occur. An increase in the number of starts as a result of cyclicity, most of all eats up the service life of very expensive parts of the boiler - gas and three-way valves, a circulation pump, an exhaust gas fan.
For ignition at the time of start, the maximum amount of gas is supplied to the burner. Part of the gas, until the moment the flame appears, literally flies into the pipe. Constant "re-ignition" of the burner further increases the gas consumption and reduces the efficiency of the boiler.
Some cyclic operation of the gas boiler is provided for by the normal mode of its operation. For example, temperature control in a room without a thermostat or with a two-position thermostat occurs due to the periodic switching on and off of the boiler burner.
The task of regulating the power of the boiler is to to exclude excessive cyclicity - clocking caused by the lack of adaptation of the boiler settings to the heating system.
To eliminate boiler clocking, it is necessary to equalize the power of the boiler and the heating circuit
You can do this in two ways:
- Reduce the power of the boiler burner to a level at which the automation can ensure the normal operation of the boiler with the heating system connected.
- Increase the maximum power of the heating circuit by installing additional radiators or replacing existing ones with more powerful ones.
You can apply both methods at once. Reduce the difference between the capacities of the boiler and the heating circuit by replacing and installing more powerful radiators. And then, compensate for the remaining difference by adjusting the boiler power.
The second method is more expensive, but sometimes you have to choose it. The fact is that in order to save money, builders often install radiators in the house without a margin for thermal power. As a result, in order to maintain the required temperature in the premises, in frosts it is necessary to supply heating water to the radiators with a maximum temperature of more than 75 about C. At this temperature, decomposition (combustion) of particles of organic dust occurs on the radiators and an unpleasant smell appears in the rooms. In addition, the high temperature of the coolant reduces the service life of polymer pipes and other parts of the heating system made of plastic and rubber.
Sometimes, the power of radiators is simply not enough to maintain the required thermal regime even at the maximum temperature of the heating water. Before adjusting the power of the boiler, I recommend determining the need, and, if necessary, increasing the power of the radiators by 30 - 100%, at least in the coldest rooms.
Above - the standard temperature regime of the radiator in systems with plastic pipes. Below are the maximum heatsink temperatures for comfortable mild heat. To switch from standard mode to soft heat, the power (size) of the radiator must be increased by about 2 times. The main advantage of low-temperature heating is the possibility of using modern technologies. We are talking about condensing boilers, solar collectors and heat pumps. They require that the system has a low heating water temperature.
When replacing radiators, it must be taken into account that the expansion tank built into the boiler is designed for a water volume in the heating system of not more than 50 liters for the Gepard boiler, and 70 liters for the Panther. If the amount of water as a result of installing new radiators turns out to be greater, then an external expansion tank must be installed.
An external expansion tank is connected to the return line of the heating system closer to the boiler. The built-in expansion tank, in this case, is best taken out of action.
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Heating radiators
How to adjust the power of the gas boiler burner
The useful heat output of a gas boiler can be reduced by reducing the gas supply to the burner. Do this by changing the settings of the gas valve.
Honeywell gas valve of the Protherm Gepard (Panther) boiler - operation diagram.
EVS1— safety solenoid valve; EVS2— electric drive of the control valve; Vm- the stepper motor controls the gas flow through the control valve.
In modern Protherm Gepard and Protherm Panther boilers, the basic settings Honeywell gas valve are changed with a stepper motor. The stepper motor is controlled from the boiler control panel through the service menu.
It should be noted that the manufacturer in some versions of gas boilers Protherm Gepard (Panther), Vaillant, instead of the Honeywell gas valve, installs SIT 845 Sigma gas valve. The settings for the maximum and minimum burner power for this valve are made by turning the adjusting screws located on the valve body. See page 2 below for details on adjusting the SIT gas valve.
The electromechanical devices of the boiler (electrovalves, stepper and conventional electric motors, sensors) are controlled by the microprocessor of the electronic control board in accordance with the programmed program. The settings of the boiler operation program can be changed on the control panel using two menus - a public user menu and a hidden service menu.
Access to the service menu of the boiler Protherm Gepard (Cheetah)
The Protherm Gepard boiler is controlled from the control panel through the public user menu. How the owner manages the boiler is written in the instruction manual.
On the control panel, you can call up another hidden menu - a service menu intended for specialists. The service menu becomes available on the display screen after entering the code.
Press and hold the mode button (1) for about 7 seconds; the display will change - a number will appear 0
. - Using buttons +
or —
(2), enter code, number 35
. — Confirm the code entry by pressing the mode button (1). After that, the display will show the 1st menu line in the form of symbols interspersed on the screen: d. 0.
- Using buttons + or — d.**.
- Press the “mode” button to change from menu line number designation “ d.**” to the parameter value (the display alternates between the “=” symbol and the parameter value). - Change the values of the displayed parameters using the + or - buttons (3) on the boiler panel. — 3 seconds after the change, the new values are automatically confirmed. To reset the display, press the "mode" button for 3 seconds. After 15 minutes of inactivity, the display returns to normal on its own.
Access to the service menu of the boiler Protherm Panther (Panther)
The control panel of the Protherm Panther boiler has some differences from the Protherm Gepard boiler. The boiler control panel has a hidden service menu, which becomes available when entering the code.
To access the service menu of the Protherm Panther boiler (Panther), you must: Press and hold the mode button (1) for about 7 seconds; the display will change. - Via buttons on the left + or — (2), enter the access code in the service menu - the number 35 in the left half of the display. — Confirm the code entry by pressing the mode button (1).
After that, the display will show the 1st line of the menu in the form of symbols d.00 with the menu line number in the left half of the display, and the numeric value of the line parameter in the right half of the display. - Via buttons on the left +
or —
(2), enter the number with the required menu line number: d.**.
To change the value of a parameter in the menu bar:- Change the values of the displayed line parameters using buttons on the right + or — (3) on the boiler panel. — 3 seconds after the change, the new values are automatically confirmed. To reset the display, press the "mode" button for 3 seconds. After 15 minutes of inactivity, the display returns to normal on its own.
The service menu commands and the procedure for setting the power of the Protherm Panther boiler (Panther) are similar to those given for the Protherm Gepard boiler.
Description of some service menu commands
Line d.00- maximum heat output (useful power) of the boiler in heating mode, kW. The range of possible parameter values is from =9 to =23, factory setting = 15 (for Protherm Gepard).
Line d.01- run-out time of the circulation pump in heating mode, min., choose a value between 2 and 60 min. Factory setting =5
Line d.02- Time delay after heating operation for anti-cycling, min. Prevents the burner from being switched on and off frequently in heating mode (this function is not applicable in DHW mode). Choose a value between 2 and 60 min. Factory setting =20 minutes. This delay (called the anti-cycling time) prevents a quick restart in heating mode after the burner has stopped at the set temperature or at the command of the room thermostat TA. It depends on the heat carrier temperature setting: — at 80 °C, it is set for 1 minute and is not adjustable. — at 20 °C, it can be adjusted from 1 to 60 minutes using the parameter d.02 in the service menu. At intermediate temperatures, between 20 °C and 80 °C, the delay value varies proportionally in the range from 1 min. up to the established d.02 parameter.
Dependence of the anticycling time on the setting of the parameter value in the line d.02 and heating temperature
Line d.18- operating mode of the circulation pump; Operating mode options: = 0 - with burner: the pump works together with the burner. =1 - continuously; with RT thermostat: the pump is switched on by the command of the room thermostat. =2 - permanent in winter: the pump runs all the time while the boiler is in the WINTER mode. Factory setting =1.
Line d.19- the speed of the circulation pump; Options for the operating mode: =0 - the burner is working; speed in heating mode is selected automatically, maximum - in DHW mode, minimum - if the burner is off = 1 - min. speed in heating mode, max. – in DHW mode =2 – automatically selected in heating mode, max. – in DHW mode =3 – max. speed in heating and DHW mode. Factory setting =2. Each time the burner is started in heating mode, the pump is switched on at a limited speed for at least 30 seconds. If the temperature difference between supply and return reaches 20 OK, the pump switches to maximum speed until the burner is switched off (even if the temperature difference has decreased). The same cycle occurs at the next ignition.
Line d.35- shows the position of the 3-way valve, heating/DHW (read only); =99 - hot water =0 - heating =40 - middle position
Line d.36- shows on the display the flow of hot water measured by the flow sensor, l/min. when dispensing hot water (read-only)
Line d.40- shows on the display the temperature of the water at the outlet of the boiler, in the direct pipeline of the heating system, about C. (only for reading)
Line d.41- shows on the display the temperature of the water at the inlet to the boiler, in the return pipeline of the heating system, about C. (only for reading)
Line d.44 - Ionization current control. This parameter informs that the ionization current is in the optimal range. The displayed value does not represent the actual current value! Value range: 0 - 10. In the range: =0 - 4 - ionization current is sufficient - the flame is available; \u003d 4 - 8 - ionization current is slightly below a sufficient level - there is a possibility of losing the flame; =8 - 10 - ionization current does not correspond to a sufficient level - there is no flame.
Line d.52- setting the minimum power of the boiler burner by shifting the minimum position of the Honeywell gas valve stepper motor. The range of possible parameter values is from =0 to =99. The smaller the value of the parameter, the weaker the intensity of gas combustion.
Line d.53- setting the maximum power of the boiler burner by shifting the maximum position of the Honeywell gas valve stepper motor. The range of possible parameter values is from =0 to =-99 (negative values with a minus sign). The smaller the value of the parameter, the weaker the intensity of gas combustion.
Line d.62- lowering the heating temperature at night. Setting range 0 - 30 about C. If you connect a timer or even a manual switch to the boiler, you can switch the boiler into two modes: day or night. In night mode, the heating temperature setting is reduced by the value set in d.62. Those. during the day the temperature of the heating water and the temperature in the house is higher, and at night it is lower. You can set it up the other way around.
Line d.67 - Display of the time between switching on the boiler. This parameter displays the cooling down time in minutes before the boiler is switched on again. The countdown of minutes starts at the moment the boiler is switched off due to the excess of the maximum operating temperature of the heating water on the boiler control panel and the room regulator is permanently closed. This parameter is important for the anti-cycling function of the boiler, when the cooling down time until the next start is calculated on the basis of the set heating water temperature of the boiler and the set anti-cycling time interval in line d.02.
Line d.70 - Setting the position of the three-way valve. In this mode, it is possible to set the position of the three-way valve, regardless of the requirements for heating in one or another circuit. Position of the three-way valve: =0 - the valve is controlled based on standard requirements from the control system; \u003d 1 - the three-way valve is set to the middle position to empty the boiler (both heating and hot water); =2 — the three-way valve is set to the position of the heating agent.
Line d.71— Setting the maximum temperature in the heating system. Select a value between =45 and =80 °C Factory setting =75 °C
Line d.88 - Water hammer protection in the distribution of cold water (for boilers KTV and KOV) . The ability to change the parameter leads to the elimination of the reaction to water hammer, which occurs in some cases in cold water pipelines. For example, at the moment the automatic valve closes in the toilet flush tank (or washing machine or dishwasher), a pressure surge (water hammer) may occur in the water pipes. This may result in a false operation of the tap water flow sensor (turbine), which will lead to a short-term unwanted activation of the boiler's DHW mode. Factory setting =0 - activation of the ignition process for heating tap water at a flow rate of 1.5 l/min Changing the parameter to the value =1 - activation of the ignition process for heating tap water at a flow rate of 3.7 l/min In this case, the duration of the flow must be at least 2 seconds.
Line d.90 - Identification of the connected room sensor. With this parameter it is possible to make sure that the room regulator is connected correctly, or the communication between the room regulator and the boiler is working properly. Note: This description only applies to controllers that support eBus communication. In the event that a conventional controller with a switching relay has been connected, this function cannot be used. Display: =0 - the regulator is not connected or does not communicate with the boiler; =1 - the regulator is connected and there is communication between it and the boiler.
Line d.96- Setting the boiler to the parameters set at the factory. In case the setting leads to incorrect operation or failures, it is possible to restore the factory settings of the boiler. Setting: =0 - replacement with factory settings will not be performed; =1 - will return to the factory settings Note: when you enter the setting of this parameter, the display always shows the parameter "0"
How to eliminate boiler clocking in heating mode
Adjustment of the maximum heating power of the Gepard or Panther boiler through the service menu
At the first stage in the service menu, as described above, we find the line d.0, press the "mode" button and look at the display the value of the boiler power parameter, kW. In our example, the factory setting =15 was visible. It is necessary to set a new boiler power value equal to the power of the heaters connected to the boiler. This setting will only work in heating mode.
If the power of the heating system corresponds to the operating power range of the boiler
The maximum power of the heating system in the house may fall within the operating power range of the boiler specified in the instructions. For example, the total maximum power of radiators in a house is 11 kW. The operating power range of the Protherm Gepard 23 MTV boiler is within 8.5 - 23.3 kW.
In the service menu, as described above, we find the line d.0, press the "mode" button and look at the display the value of the boiler power parameter, kW. For example, the factory setting =15 will be visible. Using the "-" button, set the new value of the boiler power = 11.
I recommend trying to set the boiler power to 20 - 30% less than the heating circuit power, for example, d.00 = 9 kW. This power should be enough to compensate for the heat losses of the house, since the power of radiators, as a rule, is chosen with some margin.
Increasing anticycling time
At the second stage, increase the anti-cycling time in the line d.02 service menu.
Factory setting d.02 =20 minutes. According to the graph (see above), we determine that, for the heating water temperature set on the display 70 about C, the burner can be restarted after 4 - 5 minutes, not earlier.
In line d.02 set a new anticycling time value, for our example, the maximum possible = 60 minutes. Line d.67 shows the time in minutes until the next switching on of the boiler. Breaks in the operation of the burner became approximately 10 minutes long. Twice as much as the factory setting, which is still too common.
Increasing the anti-cycling time causes the burner to start later, at a lower heating water temperature. The heat input from the boiler to the heating circuit is reduced.
Thus, selecting boiler power and anti-cycling time settings through the service menu, ensure that the duration of the cycle between switching on the boiler burner is at least 15 minutes. That is, the boiler should turn on within one hour no more than four times.
I note that not all brands of gas boilers have the ability to adjust the anti-cycling time. In this case, it is necessary to select only the boiler power settings.
On some brands of gas boilers, the rotation speed (capacity) of the circulation pump is set manually by a switch on the pump. To reduce the boiler cycle, it is recommended to increase the pump speed.
Setting the Gepard or Panther gas boiler to power below the minimum
At the third stage setting is in progress the minimum power of the boiler, by an amount lower than that specified in the instructions.
Such a setting is not necessary in all cases, but only when the first and second stages do not bring the desired result. As in our case, when at the first stage with the “-” button we set a new boiler power value = 9 (the minimum possible setting corresponds to 8.5 kW.). The newly set value of the maximum heating output of the boiler (8.5 kW) is still very different from the power of heating devices (4 kW).
It should be noted that setting the boiler power according to the method described below is also useful in other cases, since it allows, through the experiment, to adjust the heating power of the boiler in accordance with the actual power of the heating circuit. The actual power is usually less than the calculated one.
Before work for setting the minimum burner power, necessary:
- Fully open the thermostatic and other valves on the radiators, and set the room thermostat to the maximum temperature. The thermostat that controls underfloor heating is set to the maximum allowable temperature so as not to overheat the floors.
- In the user menu of the boiler, set the maximum operating temperature, which the owners set in the very cold, adding another +5 °C. Usually it is not less than 65 °C. If the owners do not remember it, or on a new boiler in the menu, the factory setting of the maximum temperature is set to 75 °C. The boiler burner should automatically turn off at a temperature of 5 °C more, i.e. at 80 °C.
- Cool the heating circuit to a heating water temperature below 30 °C.
Next, start the burner in heating mode, select the line in the service menu d.52, press the “mode” button and see on the display the value of the gas valve stepper motor position parameter in the factory minimum power mode.
Having removed the front cover of the boiler, we visually observe the size of the flame in the burner. In our example, the display showed the factory setting, the number = 72, and the height of the flame in the burner was large enough.
Use the "-" button to set a new parameter value in the line d.52, for example =20. 3 seconds after the change, when the new value is automatically confirmed, we observe a significant decrease in the height of the flame in the burner. This indicates that the useful output of the boiler with the specified setting will be greatly reduced.
Further, the temperature increase in the direct heating pipeline at the outlet of the boiler is observed on the display. Typically, the temperature rise stops when it reaches some value less than the set value, for example 52 °C. The boiler is running but the temperature is not rising (or changing very, very slowly). This means that a power balance has been reached between the boiler and the heating system at this steady water temperature. At this moment, we increase the parameter in line d.52 of the service menu, set a new value = 30 - the temperature starts rising again and stops again, for example, at 63 °C. Again we add the value of the parameter in the line d.52 = 35 and so we select the parameter until the temperature stops at a value slightly higher than the maximum, for example 77 °C. In this way, a balance is achieved between the power of the boiler and the heating circuit at the maximum operating temperature. The boiler output will be set to the minimum required for operation with the connected heating circuit. In this case, the cycling of the boiler will be minimal.
If the radiators do not warm up well in height, the temperature difference in the direct and return pipes at a maximum temperature is more than 15-20 °, then the bypass valve actuation pressure is increased. See below for how to adjust the bypass valve. The temperature of the water in the forward and return pipelines can be seen on the display if you enter the service menu, lines d.40 and d.41.
In case of adjusting the bypass valve, the setting of the gas valve in line d.52 must be repeated.
In our example, the burner heated the water to a maximum temperature of 77 about C at the minimum value of the parameter in the line d.52 equal to =28 (factory setting was =72). With a lower value of the parameter, the burner could not heat the water to the specified temperature. And at a higher value, the burner heated the water to 80 ° C and the boiler automatics turned off the combustion.
It should be noted that the gas valve adjustment method described above, which allows balancing the boiler power with the heating circuit power through the experiment, is not included in the recommendations of the boiler manufacturer. This is the idea of the author of the article, successfully implemented when setting up autonomous heating systems with gas boilers.
Gas valve factory calibration
Honeywell gas valve. 1
- fitting for measuring gas pressure at the outlet to the burner; 2
- fitting for measuring pressure at the inlet. The boiler manufacturer prescribes to calibrate the minimum power on the gas valve as follows:
In line d.00 of the service menu, set the parameter =9, which limits the boiler power to the minimum level specified in the instructions. Turn on the boiler in heating mode.
A manometer tube is connected to the upper fitting at the outlet of the gas valve. Before connecting, it is necessary to unscrew the locking screw on the fitting by 1-2 turns.
call string d.52 service menu. And changing buttons + and — string parameter value d.52, set the minimum pressure at the outlet of the gas valve, indicated in the boiler manual. For example, for the Gepard 23 MTV boiler, the minimum pressure in front of the burner is 1.5 mbar or 15.5 mm w.c..
This setting will ensure the operation of the boiler with a minimum power specified by the manufacturer - 8.5 kW. To the obvious question of what to do if the power of the heating circuit connected to the boiler is less, the service instructions of the boiler manufacturer do not give an answer.
In our example, after setting and setting in the line d.52 parameter =28, pressure measurement at the outlet of the gas valve in front of the burner showed a value of 4 mm w.c.
Readers in the comments ask the question: “Isn’t such a significant decrease in gas pressure on the burner dangerous for the boiler?”. There are many different protections on the boilers, but there is no protection against low gas pressure on the burner. From this we conclude that low pressure in itself is not dangerous for the boiler. It is important to ensure stable ignition and stable combustion of gas, as the boilers have appropriate protections.
The home master can roughly estimate whether the gas valve settings correspond to the factory settings without resorting to measuring the gas pressure at the valve.
To do this, in line d.00 of the menu, set the parameter =9 and turn on the boiler in the mode of minimum heating power. Record gas meter readings. After 15 minutes (1/4 hour), the meter readings are recorded again and the gas flow rate during this time is determined. For example, we determined the gas consumption of 0.289 by the meter m 3 /15 min. Multiply this value by 4 and get the gas consumption per 1 hour in the minimum power mode 1.156 m 3 / hour. Compare the obtained value with the data of the factory instructions. For example, the standard gas consumption in the minimum power mode for the Gepard 23 MTV boiler is 1.15 m 3 / hour. Gas consumption according to the meter readings approximately corresponds to the factory norm. We conclude that the setting of the gas valve in the minimum power mode complies with the requirements of the factory instructions. If not, then the gas flow is corrected by changing the parameter in line d.52.
Similarly, according to the gas flow, you can evaluate the setting of the gas valve at maximum power by switching the boiler to the DHW mode.
Power 23.3 kW. corresponds to the maximum pressure at the outlet of the valve 85 mm w.c.
U - figurative manometer
A simple manometer for measurements on a gas valve can be made from a transparent plastic tube, filled with water and bent in the shape of a U. One end of the tube is put on the valve fitting, and the other is left open. The ruler measures the difference in water levels in the branches of the tube. The measured distance will be equal to the pressure in millimeters of the water column - mm w.c..
On the gas valve fitting, you can tightly pull a tube with an inner diameter of 8 mm. For a tube of a different diameter, you will have to select an adapter.
At the end of the measurements, do not forget to carefully tighten the screw on the measuring nipple and check its tightness.
European gas heating equipment has long been not only competitive in the world market, but has also taken a leading position in some countries. For example, Czech gas boilers Proterm Gepard are popular in Europe and the countries of the former USSR.
The principle of operation and technical features of the equipment
Cheetah boilers are produced with a capacity of 23 kW, while they are able to provide heating and hot water to small residential buildings, apartments in high-rise buildings and small industrial enterprises. The heating of water and the heat carrier of the heating system takes place in a heat exchanger made of steel. The lamellar form of the heat exchanger increases the area of absorption of heat produced as a result of burning natural gas.The residual products formed as a result of gas combustion are removed through a coaxial chimney supplied with the Proterm Gepard 23 MTV gas boiler, or purchased separately. The flow of oxygen into the closed combustion chamber is produced by a forced ventilation system through the external channel of the coaxial chimney.
For the necessary control and management of the boiler, a small LCD display is provided, located on the front surface. The display clearly shows the current work program and additional indicators that monitor the normal operation of all components during self-diagnosis. These include:
- Protection against freezing of the coolant in the boiler, automatically turning on the circulation pump and the burner when the temperature drops below the set parameters.
- Overheating protection allows you to protect the gas boiler Protherm Cheetah 23 MTV from burnout of the furnace.
- Control of gas combustion in the combustion chamber, automatically shutting off the gas supply if the burner goes out.
- A draft sensor that turns off the gas supply to the boiler in the event of a lack or unstable draft.
The modulating burner makes it possible to smoothly adjust the heating of water and coolant, the load on both circuits can be changed separately. The increase in power and the switching of the boiler operating modes to DHW occurs as soon as the hot water tap is opened. The boiler is capable of supplying up to 11 liters of water per minute, heated to a temperature of +60C, provided that the temperature of the incoming water is around +30C.
If necessary, wall-mounted gas boilers Protherm Cheetah 23 MTV can be equipped with a climate control system and weather-dependent equipment that can automatically change the heating temperature when the weather conditions change.
Advantages and disadvantages
There are practically no drawbacks to wall-mounted gas boilers Proterm Gepard23 MTV. The only thing - like other similar equipment, Cheetah 23 is not able to work without electricity. The advantages of heaters are much more: - Natural or household gas is a relatively cheap type of fuel available in any region through central gas distribution lines or pumped into cylinders and.
- The level of harmful emissions is minimal and mainly consists of carbon dioxide.
- The compact dimensions of the equipment allow it to be mounted in rooms with a limited area.
- Full automation of work processes makes it possible to operate equipment without human intervention for a long time.
- Built-in security systems ensure reliable operation of the boiler throughout all operational periods.